Advantages certainly present

Even if you're not a fan of software subscription models where you have to pay on a regular basis to contribute to the use, as with Office 365 Home Premium, so there are quite a few advantages, but you have to individually weigh:

Includes 1) Finite an Office version for individuals, which is not so expensive and Outlook
2) Who can use it: 5 licenses per household can be very convenient, and (if you can also use them) naturally concessionary the subscription price per installation
3) VERY IMPORTANT: You can very flexibly deal with the 5 licenses. One can unproblematic transfer a license to another computer (for example because you have bought a new computer or because the hard disk has getausch (!)). This is no longer possible with the retail and OEM versions of Office 2013 !!! Here the software is tied to the first activation of the hardware permanently, a transfer of the license to another computer is excluded there. If buying a new one or upgrade the computer, you must purchase the license again! There is also the Web reports that even the exchange of the hard disk will be interpreted as a new computer by Microsoft and you have to re-purchase the Office package (in the retail bzw- OEM version)!
(You see. Eg)
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UPDATE: Due to the current legal situation, the corresponding passage in the license terms of Office 2013 is not valid according to statements by Microsoft in Germany. CURRENTLY one should at least phone can perform the activation on the new computer (after uninstallation on the old machine) in Germany!
But note this particular pointing to Update 3 and 4
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Since the subscription model has of course significant benefits!
4) Also in mixed environments in the household (there are both Windows and Mac computers) was designed with only the 'old' version of Office 2011 for Mac is available
5) Well, who needs it and wants to use: Monthly 60 minutes Skype, SkyDrive with 20 GB of memory and full support during the term
6) Upgrades There are free. This is for Office 2013 is currently rather less interesting (unless Microsoft strongly shortened version cycles, who knows ...) but could be interesting for Mac users, because it might not be long until Office for Mac also new come out.

And now for the potential disadvantages:
1) If you do not need 5 licenses, but perhaps only one, Office is expected over the years quite expensive.
2) It may well be that increasing subscription rates for an 'implementation phase'. This therefore has a certain price risk in the future.

If you do not need as many licenses its Office software also does not want to bind to the hardware (currently not applicable to Germany) and the new features of Office 2013 can do without, which should seriously consider to add itself any Office 2010. But you should make sure that it is the retail version of Office 2010 and not PKC-version (without disk), because in this, there are, according to License Agreement also a permanent hardware binding!